An NMR investigation of the incoherent tunnelling exchange in a niobium trihydride

The incoherent contribution to the tunnelling exchange of hydrogen pairs in NbH 3 cp′ 2 (cp′ = C 5 H 3 (Si(CH 3 ) 3 ) 2 ) was investigated by 1 H-NMR line-shape analysis and two-dimensional 1 H-NMR exchange spectroscopy. The experimental data were analysed by fitting them with simulated one- and two...

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Published in:Molecular physics 1998-02, Vol.93 (3), p.471-476
Main Authors: DREXLER, U., WIEDENBRUCH, R., SCHEURER, C., MEYER, R., ERNST, R. R., CHALOUPKA, S., VENANZI, L. M.
Format: Article
Language:English
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Summary:The incoherent contribution to the tunnelling exchange of hydrogen pairs in NbH 3 cp′ 2 (cp′ = C 5 H 3 (Si(CH 3 ) 3 ) 2 ) was investigated by 1 H-NMR line-shape analysis and two-dimensional 1 H-NMR exchange spectroscopy. The experimental data were analysed by fitting them with simulated one- and two-dimensional spectra, taking into account the coherent and incoherent tunnelling contributions and nuclear cross relaxation. The dissipative exchange process shows an Arrhenius-like temperature dependence with an activation energy E a = 69(2) kJ mol -1 over the temperature range 246-341 K.
ISSN:0026-8976
1362-3028
DOI:10.1080/002689798169159